Rewrite the sentences without changing th first meaning

Exercise 1:Rewrite the sentences without changing th first meaning.
1.She can save much water by taking showers insead of baths.
->If she...................................................................................................
2.They are going to build a new bridge in the town.
->A new bridge.......................................................................................
Exercise 2:Complete the second sentence so that it has the same meaning as the first one.Use no more than four words.
1.He is tired, so he can't score any goals.
->He can't........................he is tired.
2.I can't play basketball well because of my height.
->I can't play.......................I wasn't tall enough.
Excercise 3:Low application:Rewrite these sentences.
."Learning English is necessary."
->It is............................................................